president obama this morning told "meet the press" the u.s. now has some "very good leads" about who carried out the deadly strike. >> there was sloppiness, not intentional in terms of how we secure embassies in areas where you essentially don't have governments that have a lot of capacity to protect the embassies. so we are are doing a thorough review. not only will we implement all of the recommendations that were made but we will try to do more than that. with respect to who carried it out, that is an ongoing investigation. the fbi has sent individuals to libya repeatedly. we have some very good leads, but this is not something that i'm going to be at liberty to talk about right now. >> the attacks, of course, killed four americans including u.s. ambassador christopher stevens. it happened back in september. how is it now that we are getting "good lead is" four months later and why haven't there been any arrests? joining us is the former ambassador to the united nations and fox's contributor are john bolton who joins us every sunday about t